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相关概念视频

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

1.4K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.4K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

598
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
598
Heating and Cooling Curves02:44

Heating and Cooling Curves

24.2K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
24.2K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

4.7K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.7K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

13.3K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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相关实验视频

Updated: Sep 19, 2025

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

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通过协同作用的电热相变换实现高效的冷却.

Guangfa Wang1, Peijia Bai2, Shaoheng Yuan1

  • 1School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tongyan Road 38, Tianjin, 300350, China.

Advanced materials (Deerfield Beach, Fla.)
|June 17, 2025
PubMed
概括
此摘要是机器生成的。

通过将它们与热相变换材料 (热PCM) 结合起来来增强电相变换材料 (电-PCM),以提高冷却能力. 这种协同作用的方法显著提高了变化和热导率,以更好地冷却电子设备.

关键词:
电热效应是一种电热效应.变化聚合物中的变化.阶段变化材料的变相材料.固态冷却系统的冷却方式

更多相关视频

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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相关实验视频

Last Updated: Sep 19, 2025

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
09:09

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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科学领域:

  • 材料科学 材料科学 材料科学
  • 热力学是一种热力学.
  • 固态物理 固态物理

背景情况:

  • 电热材料 (电电PCM) 提供环保,低能耗和小型化的冷却解决方案.
  • 有限的变化和导热性限制了电子产品电PCM设备的冷却能力.

研究的目的:

  • 通过协同结合电热相变来提高电PCM的冷却性能.
  • 通过与热PCM堆叠来改善电PCM的变化和热导率.

主要方法:

  • 电热相变材料 (ETPCM) 的开发,通过将电热PCM和热PCM堆叠在一起.
  • 描述ETPCM堆的变化和热导率.
  • 使用模拟电子芯片和静电驱动原型验证冷却性能.

主要成果:

  • 与电电PCM相比,ETPCM堆显示了变化增加4.68倍 (高达132.35 J kg-1 K-1) 和热导率增加2.39倍 (高达0.43 W m-1·K-1).
  • 基于ETPCM堆的冷却装置实现了一个模拟电子芯片的温度下降49.32K (1.75W cm-2).

结论:

  • 协同的电热相位变化显著提高了电PCM中的变化和热导率.
  • 开发的ETPCM堆显示了高效电子冷却应用的实际可行性.
  • 这种跨学科的融合方法为先进的电热制冷技术开辟了新的途径.